Being new to rails and ruby, I am trying to figure out how things fit
together.  In particular i am trying to understand how attributes such
as "session" and "cookies" are made available to Controller tests.
Specifically I am working on a test from the RailsSpace book which
extends Test::Unit::TestCase and only imports the module
ApplicationHelper while attributes such as cookies and session are
defined within the ActionController::TestProcess module.   I cannot
figure out how module ActionController::TestProcess is included within
the UserControllerTest.

require File.dirname(__FILE__) + '/../test_helper'
require 'user_controller'

# Re-raise errors caught by the controller.
class UserController; def rescue_action(e) raise e end; end

class UserControllerTest < Test::Unit::TestCase
  include ApplicationHelper

..
..
 def authorize(user)
    @request.session[:user_id] = user.id
  end

  def friendly_url_forwarding_aux(test_page, protected_page, user)
    get protected_page
    assert_response :redirect
    assert_redirected_to :action => "login"
    post test_page, :user => user
    assert_response :redirect
    assert_redirected_to :action => protected_page
    assert_nil session[:protected_page]
  end

  def cookie_value(symbol)
    cookies[symbol.to_s].value.first
  end

  def cookie_expires(symbol)
    cookies[symbol.to_s].expires
  end

thx.

-karl

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